3) Rose Tyler: Earth Defence
Doctor Who is such a long-running, expansive show that it makes complete sense that it has had numerous spinoffs over the years. Previously, the adult-orientated Torchwood and the child-friendly The Sarah Jane Adventures ran for four and five years a piece, and this year will see the debut of another in teen-centric Class.
Former showrunner Russell T. Davies actually had an idea for yet another spin-off at one point, based around ex-companion Rose Tyler (played by Billie Piper). It would have seen Rose protecting a parallel Earth – the one she found herself in after leaving the Doctor – from alien threats. The BBC were enthusiastic about the idea, with the plan being that it would be a series of annual one-off specials.
Even though work on the spinoff was ready to begin, Davies had a last-minute change of heart and scrapped the project. He later explained that he thought it was “a spinoff too far.”